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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba6e22d1f32b01242af620a56c2dbe14306407d38242f1c6300298c62e33e15' 
  AND token = 'EcaEyXReYGQ2vMe5xF7p2IZQR5ccHPS3f11oFSWV6DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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