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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9847d3f2327b83a9c95fdf537bae25b2344e9faf1be523856ff1fdf972b3a778' 
  AND token = 'z5UGo2YGcFHxIn39ravtZn/XTHMb7pi1DTP4gTtUfpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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