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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80fa1270bf6bffe6df3075371c710ac877d4c2001d8e703feb6b4232c1c4e6c6' 
  AND token = 'LAkC5kOdNxsZ6jZtqaKXJKzrS6EVXEy0B18GIXWPfAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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