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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59a05176a626c7a85d44209a77efb73bb4e01c560104365f1a3ed2fd7472fd7' 
  AND token = '5KcrpQOAVMFJn+tprICNxpAFw8V65wG+8zrP1gVWoqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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