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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8477c0a3eb44ab780b9114fa4f0a609a25902ef2bde5510939045a38b104e8' 
  AND token = 'allepR4+KIT0Y/HTOwc1GUS89juiTCV6o97eVD+MOKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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