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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d95ac438459d4913930f4d10ed04661333641396dd61d7be07203b0c8f458b4' 
  AND token = 'VH/sqkPetMDT1Xv3D4xHyKDzXXZGHvJDUuxX+SGg0Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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