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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92011e2ec23c9bc472744e5a6022a8df3c06d58011070cd46b9536bec916b312' 
  AND token = '/y2K/eqJ2Zx5pogyWo1pOyIjv4W7ihEPIQV5wrFMRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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