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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7325018d12631bb532c3f814a4d9ced2f4c516e6274bbd6916d66b5e8806a5' 
  AND token = 'jZkGbAky5q5UFceuGLADqnJpoNRSDzbInFT4Gbz0tgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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