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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6776123727af0a97436e4c90e51caedee7c2746d48df34ec54b353952381466f' 
  AND token = '/gNlgCikU26+w43f1/ndLPbWa3EWldF/a3J3lXQwbvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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