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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a67ecd4aa88773295bd88c5562dc0c7f1dfd5a26690dbe42b2150c902a8217' 
  AND token = 'wNxJ3+iDD0T5Sp7N37yIea+r/9STcoK9syXhKiRrSCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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