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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e3594658f29073b0c18e7591e6a9c10a0f375904b475e6387b53de362a4046' 
  AND token = 'cQfjCPenAmTihc8SiUZrE0VUAZWc/+Pf2Qotis66wDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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