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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38b10300092907c308d87827e813aa32e3a1bbe5ce9de460fd65be0426efba9' 
  AND token = 'nIfTI0YDxn7mW8GotiKJtzoNpZsDRg2RrilxnlJQYbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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