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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7585f3baf8893fd833280c131cb6953d154f88ae7cda8b6b0916ef04a13b6732' 
  AND token = 'RPdyqyRi9N9seb94wmVCmNkiPelJCOU88GZOK5UBCQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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