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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a407df9c1dda76d30060ca158957d297ff11f3906a2fcb5a41a03928098587d6' 
  AND token = 'TRbieCATrqss6x4Kc57ax2tII6KBNmQIuMRiStQwoVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}