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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a26d1239ead6d9b9499af4f91841ac638643f917863566a31f034834316f12b' 
  AND token = 'Nj7MCfdpE8u2lNxgvh5VGNU0fW8CVfyRDjaWWoE/67w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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