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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104d6b84bbca877d1e27f4b42a6afffb7acad83c690052f1b1bc58ebc94ab9b7' 
  AND token = '3dcPwEiraVNdPGZy7AhzeK5UrFTl6x1b7gEFACNMmp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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