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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a5e55c6649a7a4cb909c9501c0fc8e77d4f78461061061a5512da74fa1fced' 
  AND token = 'rnYCAQZ4Zm1ktIVkAeCW9J97qIuucv5sQeBELPVfSX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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