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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7860f4eeeed61549cd6ff0f7428af78ef060a2b9e62a868210fb5e254eb5d934' 
  AND token = 'rDXSf+oEmujrd0/Nb0h3PSyEgjTofHoziFsOSj5cr0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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