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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7fc05983f546da7c9856ce6c36772a40ab12d1fcd147d5a8fdce863439dd1e' 
  AND token = 'FKNuNfFGTAf7P15x/pGKZ5+N53QfuxQgSVCYkEqK3ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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