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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca2886ce60cc36fb14142a418ecf7ff1944f94d5fb1f0812a0c6ee98ae1cfee' 
  AND token = 'zegVBMDHA+Dc1qeEdbGIgcBy3yuvARLLTumCNfrmn+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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