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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb6976247f21d08221fbfdb6947b9118696fe0d085f29a44420bcf42b748430' 
  AND token = '+Bz7vg7dkgzmPER120EonnH8AV/3Dzdq9BLzWuyPNIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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