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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b8534a6cf6af7314bf4eba2fc1edff32e650e2080a681dc5043af455c5c2fc' 
  AND token = 'DktX9z2+ErTl+RP/ZS0w3V6FXyU1FbfYm1MRKZENhhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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