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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4053e03abab18bc633ab7b33a64b12d2287a932306655b581a54956a8b3e93bb' 
  AND token = '1vfK9VvMbvCWI8vNEjkSwUnlqVaiB/HQNbDEgXgLmWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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