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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6babf82dadded9fa53431a5fec83ad1ee836033ea1d52a0f60307df0c0789e' 
  AND token = 'CupecExMFsS0d+hONRyJdHkWKIEsTr3CkMnFMmj0e7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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