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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba46f292dcd2dbc1fdebb2c255e13719b4d1eb4ed53a9258d900bcef0de6101' 
  AND token = '7HO9hYVBD43b99NeQCRpegzH8cev02vo2dWuJK6Z7Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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