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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0520d38d986b4db6e077c33b57f28164f88b195ca85c10e379a6a0937fbc87da' 
  AND token = 'zzZEUcDhKbh/6NAk5MMoMSpbjnp+VM9lme4VoES1baY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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