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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e25c4069b11dd55c442b9acd1450ae1dc02213806de986751c10ca2d592fe' 
  AND token = 'bePO0vDTlJXSTL1v0egpUK4PTFM9eAkk4YwHi8dP2So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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