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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0605b7a7d88c96370af0f53ad695afb6ad707ffe995c123142f9bc6fb5abaa' 
  AND token = 'DFXN5bRztl8CVQHyxvZVSOBkWgBoxYBCTrUty944jos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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