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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98298382c91e9c639ee22a2660a7e1cd7d4db94f57bd9d3aad7116740dcf267' 
  AND token = 'sOSpla+NX1/KrYTd1fUQRgcxQebh/FBk6KuOLb+Gz+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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