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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61422e4ae65432729625a0f6086fbdfb76873308816d0f26c621dabe187a82d8' 
  AND token = '1/2hTXm7QBqlE96IyRsVt+yt7csGXsyZ2TJs79MEP+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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