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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47012ee2bf0902851889a0028dc61b6f652915d0157e65bc6e9289cddf6325bc' 
  AND token = 'sRs9rXkr767z3al495q2lsg4jj5y4V1SrlB8RDeNjQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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