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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c304f0dbf25b48446d536ef17479fbd8eb208e0719e1fb3bf55c0ec60e43d' 
  AND token = '5/M9K4/BSwqXWKG7SUDTwR+Crhx5eSHyhbl0HE0nF/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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