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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469106d0c4fd007a2f2e8d3234b9d87c203e785861c47049d28645a4d8b5d8ea' 
  AND token = 'w8HD0ssMFujXW6rJaI5wd+av9Jjke0mbpPma/WTe4ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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