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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca02478a3011ae61fab8b18cfbc9ed98efe0768949f0a8e2e984ae75272b7096' 
  AND token = 'OjbD//GI6GGrJ6sb99ONOHiLaSd8cR6Ylq8NvYInYkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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