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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7e93db73e363ee28ccf2b31b119d6fa3d256b1fe3d94cfee327d991e4222c9' 
  AND token = 'ToBVSrakz6u8YpVBh0gNsIPyz5+2D/gAC5h2ymyGeno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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