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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928bc20a99a68cca25e71974be4102f493dc7b90eb70718bd4c55f3148c8443d' 
  AND token = 'WZRhX7XgOSzU2oil0Fd8Ng0phV109ZOvDJ4oicl83oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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