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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee01d9b1c54c63974eaf94c6627f469aa5305f0f2a4819b7cd76889ca446b3f' 
  AND token = '+8mmc+mL3tKQWAVHA8p8IlrtB3QO5p4q6RTcu9yOy/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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