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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd96371a11f410550cbc046f8fa516368f73196a2cf5d2d69a4d7cf03ab3048' 
  AND token = 'NL6Rrcd7F2Xa6gxtLoqnqACbOjS+lIaSnJH2lSkovsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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