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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0dfd6278dbc9dd7d125e515d9d5749f0774f29c40c80cce56fcf40d6383cb4' 
  AND token = 'WvWgoYu0OgDqa/m2e4CLJj1yTdAGkoiFhZWmaifAlj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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