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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9e564bedd60689de238360c5d1f6a6610dffe0cee1e0b0327eca04be8af5e7' 
  AND token = 'dwpkkTZXlhy4B+AqjRjxOPR9TMpdv0d/bwk9db+0VwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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