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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3ada60852367700e70dc9b752eb96d3769f867a7d873274d1daee956fbe24f' 
  AND token = '5qGwWu1mlxNouvzc9d2X9yPLp0T4z0N8bvZQqJDxayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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