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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6ca7d75e515484f56f832245a9c2c9c0580c7308c5841fc7bce0378fe620c5' 
  AND token = 'A3hKoerrvn2xAnufEpz9cuEhqEK9AfBlZo1v+Iv5mLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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