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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147ca4f09cd900416a32b0c0b6d5e8f4a39dec11844fb0e20c92602f6b481b91' 
  AND token = 'BwNJrwepSyTT7sHU3Fg5179xfVw3WyxzNb/tlKP/H+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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