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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab74e674e7254ab9c3df3b0af0f9f442133c6e0849bd5470731e3df712a61c90' 
  AND token = 'OhRfxECe7cdAldzuTqOeAth/EzkzjjQ3EiE41rvqdG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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