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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d443c271561b9adacfaf37ea8d37b58686fb5f411826ea885cf84b26aa02ef' 
  AND token = 'P63ZgPM6Y70Ii23mZW6Xk2tXf12CGaOt+3ixOvviS2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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