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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ae12f34d9e0c1f16a6cab489b04b1556dd9938e67a02e7bf381ae433929035' 
  AND token = 'fUFMpQCSxOb0nKTKv8A+LWYDvr/0CqppUbrokcs/Rpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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