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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeababb9fc7720cfdaef8378d8c5a8930e2ad44bba598e441ea21b171b488fd5' 
  AND token = 'prlQhTM+OQcwzXZsY3Hih7t8gRQ7aLRJxvrh/9XnKMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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