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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae96a9a72bf8f3a826b7816ca1a68d6bed38c539b795abd2ac445d0fde25a8a' 
  AND token = 'kQ8GIU0vlOozz5VoXmzz1Cyt6yruPfFusbeOW5YGYqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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