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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd703bce6e22b0ff4bda600df2a95501a427aa9a981feeb4eb5b9c07b7b0c676e' 
  AND token = '11tYXM/9VL2G4y9bVBjVTPf/jHa5K1+d7vvzEHlgFoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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