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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034e187d8f030531c29adfbba87eb81b837d4a1c82fb21a364001fcac189c266' 
  AND token = 'H1YlkmRHJaKCR7be22NsNL8sZqBQ99dTXH158yTs/so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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